Abstract: In a working machine, a plurality of diagonal members includes a plurality of first diagonal members for connecting a first main member and a second main member with each other, the first diagonal members including a first nearest diagonal member located nearest to a first connector connected to an end of the first main member. A first reinforcement part extends from the first nearest diagonal member to the second main member or a second connector in a first specific direction for connecting the first nearest diagonal member and, the second main member or the second connector connected to an end of the second main member with each other.

Abstract: A mobile crane includes: a lower traveling body including a pair of crawlers; an upper slewing body supported on the lower traveling body slewably about a slewing axis; a tiltable attachment including a boom tiltably supported on the upper slewing body; and a physical quantity detector. The lower traveling body has a reaction force receiving part for receiving a reaction force from the ground at a position away from the slewing axis in a boom direction in a state where the pair of crawlers are in contact with the ground, the boom direction coinciding with a horizontal component of a direction in which the boom extends from the upper slewing body, and the physical quantity detector detects a physical quantity which changes in accordance with a change in the reaction force received from the ground by the reaction force receiving part.

Abstract: An upper turning body mounted on a lower body for a crane includes a turning frame mounted on the lower body to turn freely, and a boom provided to the turning frame to be raised and lowered freely. The turning frame includes a pair of attachment brackets to which a base end section of the boom is attached such that the boom is free to be raised and lowered, and a frame body to which the pair of attachment brackets are provided with an interval in a left-right direction of the upper turning body. The frame body is formed of a plurality of divided frames arranged side by side in the left-right direction of the upper turning body, adjacent divided frames of the plurality of divided frames being separably joined to each other.

Abstract: An upper turning body mounted on a lower body for a crane includes a turning frame mounted on the lower body to turn freely and a boom provided to the turning frame to be raised and lowered freely. The turning frame includes a pair of attachment brackets to which a base end section of the boom is attached such that the boom is free to be raised and lowered, and a main frame to which the pair of attachment brackets are provided with an interval in the left-right direction of the upper turning body. The dimension of the main frame in the front-rear direction of the upper turning body orthogonal to the left-right direction is smaller than the dimension of the main frame in the left-right direction.

Abstract: An upper turning body mounted on a lower body for a crane includes a turning frame mounted on the lower body to turn freely, and a boom provided to the turning frame to be raised and lowered freely. The turning frame includes a pair of attachment brackets to which a base end section of the boom is attached such that the boom is free to be raised and lowered, and a frame body to which the pair of attachment brackets are provided with an interval in a left-right direction of the upper turning body. The frame body is formed of a plurality of divided frames arranged side by side in the left-right direction of the upper turning body, adjacent divided frames of the plurality of divided frames being separably joined to each other.

Abstract: Provided is a coupling unit capable of accurately determining a relative position between connectors despite welding across main pipes and connectors in a lattice structure. A coupling unit includes connectors to be joined to ends of main pipes, and a connector interconnection member that interconnects connectors to one another. Each of the connectors includes: a fitted part fittable to the end of the main pipe; a detachable connection part detachably connectable to a counterpart connector provided to an end of the other lattice structure; an outer peripheral surface weldable to an outer peripheral surface of the end of the main pipe while the fitted part is fitted to the end of the main pipe; and a connected part to which an end of the connector interconnection member is to be connected.

Abstract: An upper turning body mounted on a lower body for a crane includes a turning frame mounted on the lower body to turn freely and a boom provided to the turning frame to be raised and lowered freely. The turning frame includes a pair of attachment brackets to which a base end section of the boom is attached such that the boom is free to be raised and lowered, and a main frame to which the pair of attachment brackets are provided with an interval in the left-right direction of the upper turning body. The dimension of the main frame in the front-rear direction of the upper turning body orthogonal to the left-right direction is smaller than the dimension of the main frame in the left-right direction.

Abstract: A bumper beam having increased bending strength achieved with a minimum increase in the weight of the bumper beam. The bumper beam (1) is mounted to the front of a vehicle, extends along a reference line (W), and is provided with a beam body (2) and a reinforcing plate (3). In at least one cross section perpendicular to the reference line (W), the reinforcing plate (3) extends linearly and the beam body (2) includes a pair of protrusions (2t, 2s) protruding, while surrounding an inner space, from the reinforcing plate (3) in a direction intersecting the reinforcing plate (3). If the Young's modulus and the density of the beam body (2) are Est and ?st, respectively, and the Young's modulus and the density of the reinforcing plate (3) are E2 and ?2, respectively, the expression (Est/?st3)<(E2/?23) is satisfied.

Abstract: A bumper structure which as a whole has a reduced weight and which has sufficient buckling strength. A bumper structure has a box-like outer shape constituted of a front flange (2), a rear flange (3), an upper web (4), and a lower web (5) which consist of a steel material. An intermediate web (6) consisting of a material other than the steel material is disposed between the upper web (4) and the lower web (5). If the Young's modulus of the steel material is E1, the density of the steel material is ?1, the Young's modulus of the material which forms the intermediate web (6) is E2, and the density of the material which forms the intermediate web (6) is ?2, the bumper structure satisfies E1/?13<E2/?23.

Abstract: A bumper beam having increased bending strength achieved with a minimum increase in the weight of the bumper beam. The bumper beam (1) is mounted to the front of a vehicle, extends along a reference line (W), and is provided with a beam body (2) and a reinforcing plate (3). In at least one cross section perpendicular to the reference line (W), the reinforcing plate (3) extends linearly and the beam body (2) includes a pair of protrusions (2t, 2s) protruding, while surrounding an inner space, from the reinforcing plate (3) in a direction intersecting the reinforcing plate (3). If the Young's modulus and the density of the beam body (2) are Est and ?st, respectively, and the Young's modulus and the density of the reinforcing plate (3) are E2 and ?2, respectively, the expression (Est/?st3) <(E2/?23) is satisfied.

Abstract: A bumper structure which as a whole has a reduced weight and which has sufficient buckling strength. A bumper structure has a box-like outer shape constituted of a front flange (2), a rear flange (3), an upper web (4), and a lower web (5) which consist of a steel material. An intermediate web (6) consisting of a material other than the steel material is disposed between the upper web (4) and the lower web (5). If the Young's modulus of the steel material is E1, the density of the steel material is ?1, the Young's modulus of the material which forms the intermediate web (6) is E2, and the density of the material which forms the intermediate web (6) is ?2, the bumper structure satisfies E1/?13<E2/?23.

Abstract: In a lattice boom, a first reinforcing lattice member includes a first reinforcing pipe which has a portion extending in the same direction as a first main member of a base boom and which is separated outward from a first side surface of the base boom and a first mounting part which is provided on the first reinforcing pipe and which is mounted to the first main member so as to transfer a load acting on the first main member in an axial direction of the first main member to the first reinforcing pipe, and a second reinforcing lattice member includes a second reinforcing pipe which has a portion extending in the same direction as a second main member of the base boom and which is separated outward from a second side surface of the base boom and a second mounting part which is provided on the second reinforcing pipe and which is mounted to the second main member so as to transfer a load acting on the second main member in an axial direction of the second main member to the second reinforcing pipe.

Abstract: This invention provides with a boom structure comprising a first straight portion, a curvilinear portion positioned contiguously to the first straight portion, and a second straight portion positioned contiguously to the curvilinear portion in a direction of the boom, characterized in that a tubular member forms one or more of corners of a generally rectangular cross-section in the curvilinear portion, wherein the tubular member has a closed cross-section, whereby capable of improving the fatigue strength of the boom and attain a reduction of its weight.